NCSUZoSo
500+ Head-Fier
"Break in" is a mechanical term that refers to things like speakers or anything using a suspension system like phono cartridges for example. The term you would use for opamps is burn in, but many people (including myself) believe it is more your brain burning in when it comes to SS electronics. Now when you talk about about tubes or even capacitors, there is some truth to it (it can actually be proven when you measure the output of the circuit), now an Opamp "breaking/burning in" that is the same as saying the binary output of the opamp's simple circuit will change. If you think it changes after 40 hours, it would only make sense to say it will still be changing at 400 hours and 4000 hours (which would not be good for any SS electronics). I know this whole subject has a kind of notorious debate around it, but from an Electrical Engineering student (Jr.) this is my opinion on the subject.